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Oracle Database SQL Sample Questions (Q260-Q265):

NEW QUESTION # 260
Which three actions can you perform on an existing table containing date?

A. Increase the width of a numeric column.
B. Change the default value of a column.
C. Define a default value that is automatically inserted into a column containing nulls.
D. Add a new NOT NULL Column with a DEFAULT value.
E. Change a DATE Column containing data to a NUMBER data type.
F. Add a new column as the table's first column.

Answer: A,B,D

Explanation:
C: True. You can add a new NOT NULL column to an existing table, provided you specify a DEFAULT value for the column. This ensures that existing rows in the table can be updated with a default value, thus maintaining the NOT NULL constraint integrity.
E: True. It is permissible to increase the width of a numeric column, provided the change does not truncate existing data. This change is generally safe as it allows for greater values or more precision without affecting existing data.
F: True. The default value of a column can be changed. This action affects subsequent insert operations but does not alter the values of existing rows. Changing the default is useful for adapting tables to evolving business rules without impacting existing data.

NEW QUESTION # 261
You execute these commands:
SQL> DEFINE hiredate = '01-APR -2011';
SQL> SELECT employee_id, first_name, salary FROM employees WHERE hire date > &hiredate AND manager_id >&mgr_id; For which substitution variables will you be prompted?

A. none
B. only &mgr_id
C. only &hiredate
D. &hiredate and &mgr_id

Answer: B

NEW QUESTION # 262
Examine the description of the countries table:

Examine the description of the departments table:

Examine the description of the locations table:

Which two queries will return a list of countries with no departments?

Answer: A,C

NEW QUESTION # 263
Which two true about a sql statement using SET operations such as UNION?

A. The names and number of columns must be identical for all SELECT statements in the query.
B. The data type of each column returned by the second query must be implicitly convertible to the data type of the corresponding column returned by the first query
C. The data type group of each column returned by the second query must match the data type group of the corresponding column returned by the first query
D. The number, but not names, of columns must be identical for all SELECT statements in the query
E. The data type of each column retuned by the second query must exactly match the data type of the corresponding column returned by the first query

Answer: B,D

Explanation:
In the context of SQL statements using SET operations like UNION in Oracle Database 12c:
A . The data type of each column returned by the second query must be implicitly convertible to the data type of the corresponding column returned by the first query. This is correct. Oracle allows the union of columns as long as their data types are implicitly convertible, not necessarily identical.
C . The number, but not names, of columns must be identical for all SELECT statements in the query. This is correct. For a UNION operation to be valid, all SELECT statements involved must have the same number of columns, although their names and exact data types need not match.
Options B, D, and E are incorrect:
B is incorrect because exact data type matches are not required, only that they be implicitly convertible.
D is also incorrect for the same reason as B; it's enough that the types are compatible, not identical.
E is incorrect as the names

NEW QUESTION # 264
Which task can be performed by using a single Data Manipulation Language (DML) statement?

A. removing all data only from a single column on which a primary key constraint is defined
B. removing all data from a single column on which a unique constraint is defined
C. adding a column constraint while inserting a row into a table
D. adding a column with a default value while inserting a row into a table

Answer: B

NEW QUESTION # 265
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